Horizontal sliding window



SePt- 20, 1960 w. P. KESSLER ErAL 2,952,883

HORIZONTAL SLIDING wINDow 4 Sheets-Sheet 1 Filed Aug. 3, 1956 bill ww ib, sgml @NJN www Sept- 20, 1960 w. P. KESSLER ET AL 2,952,883

HORIZONTAL SLIDING WINDOW 4 Shee'cs-Shee'l'I 2 Filed Aug. 3, 195e Sept. 20, 1960 w. P. KEssLER ETAL 2,952,883

HORIZONTAL SLIDINO WINDOW Filed Aug. 5, 1956 4 Sheets-Sheet 3 Sept 20, 1950 w. P. KEssLr-:R ET AL 2,952,883

HORIZONTAL SLIDING WINDOW 4 Sheets-Shea?l 4 Filed Aug. 3, 1956 im P Zalm rase Il@ Qqqf IEM/06745 L M, @MQ/*KJ Q-far 77?@ States atent @nice 2,952,883 Patented Sept. 2 0, 1,960

I-IORIZGNTAL SLIDING WINDOW Ward Philson Kessler, Houston, Tex., and John P. Malmrose and Rupert L. Evans, Kewanee, lll., assignors to Kewanee Manufacturing Company, a corporation of Illinois Filed Aug. 3, 1956, Ser. No. 601,968

Claims. (Cl. 2li-52.2)

Our invention relates to a horizontal sliding window, and more particuarly, to windows of this type havingseveral sliding sashes or vents.

A study of conventional horizontal sliding windows has revealed that they have proved to be unsatisfactory for a number of reasons. For instance, most forms become defective in operation after a relatively short time; this is because the sliding sashes or vents are mounted on tracks formed on the window frame sill, and the sill of conventional window frames often bends or Warps shortly after installation, with consequent deformation of the tracks and interference in operation with the sashes. Moreover, conventional windows of this type have proved to be drafty and they malte no provision for handling moisture condensation that occurs on the glass and metal surfaces and drains down to the window frame sill.

A principal object of our invention is to provide a horizontal sliding window that is and remains eiortless in operation, oiers maximum weather-tightness, and is readi ly installed.

A further object of our invention is to provide a horizontal sliding Window of the type having tracks for the sliding vents thereof, wherein the frame sill is formed to be of maximum strength and rigidity and insures that the sash' or vent tracks remain level and true for smooth, easy operation.

Still a further object of the invention is to provide a horizontal sliding Window arranged to handle moisture condensation accumulation.

Another object of the invention is to provide an improved pane mounting for window sashes.

Yet another object of the invention is to provide an improved latching device for horizontal sliding Windows.

Still another object of the invention is to provide a burglar proof form of horizontal sliding window which permits the vents or sashes thereof to be easily removedA for cleaning.

nYet a further object of the invention is to provide a horizontal sliding window to which screen and storm sashes may be readily applied.

Yet still a further object of the invention is torprovide a horizontal sliding window that is inexpensively manufactured, convenient in use, and readily adapted for application to a wide variety of building conditions.

Other objects, uses, and advantages will be obvious or become apparent from a consideration of the following description and the drawings.

ln the drawings:

Figure 1 is an elevational view of a preferredY embodiment of the invention looking from inside the window, showing the same applied to a nished Wall structure;

Figure 2 is a cross-sectional view along line 2 2 of Figure 1 Figure 3 is a cross-sectional view along line 3-3 ofV FigureV 1;

Figure 4 is a cross-sectional view along line 4--4 of Figure 2, showing both Ysashes in section;

Figure 5 is an exploded perspective view of a number of the rail elements forming the inner or inside vent or sash;

Figure 6 is an exploded perspective view of the elements forming the window frame structure in which the sashes are mounted; v

Fig. 6a is a fragmental elevational View illustrating the right hand upper corner of the inwardly facing side of the windowframe;

Figure 6b is a fragmental plan view of the inwardly facing side of a jamb illustrating the sash latch catch yelement iixed to each frame jamb, with parts broken away;

Figure 7 is an exploded perspective view of the elements forming the outer vent or sash, With parts broken away for clarity of illustration;

Figure 7a is a side elevational View of a glide block employed in the illustrated vents or sashes;

Figure 7b is a sectional View of a gasket or sealing element in which the transparent panes of the sashes or vents are received;

Figure 8V is an elevational view illustrating our improved latch employed on the sashes of our Window;

Figure 8a is a perspective view of a spring element employed to bias the latch illustrated in Figure 8;

Figure 9 is a fragmental perspective view illustrating an aligning block employed on the sashes of our window;

Figure l() is a iragmental perspective view of one end 0f the sill of the window frame, showing a portion of a jamb applied thereto;

Figure 11 is a fragmental elevational View further illustrating a burglar proofing locking device shown diagrammatically in Figure 1;

Figure 12 is a cross-sectional view along line 12-12 of Figure 11;

Figure 13 is a cross-sectional view along line 13-13 of Figure 3 illustrating the manner in which the inner sashgo'r vent is removed; and

Figure 14 is a cross-sectional view along line 14- 14 of Figure 3 illustrating the manner in which the outer ventisk removed, Y v I GENERAL DESCRIPTION Reference numeral 10 of Figures l, 2, and 4 generally indicates a preferred embodiment of our invention applied to a vconventional wall framing structure 12 about which` a conventionall outer masonry structure 14V has been erected.

The window 10 generally comprises a window frame 1,6, an inner sash orvent 18, and an outer sash or vent 26.`

The window frame As shown more particularly in Figures 4 and 6, the window frame comprises a sill 22, two jambs 24, and a head section 26. These elements may be lformed out of any suitable materials, but preferably are provided in the form of extruded aluminum sections.

The sill 2,2 compnses a generally quadrilateral tubular element (SQCFigure 4) having a plurality of anges eX'- teuding from its upper and lower surfaces. As seen in Figure 4, the` upper" surface 28 of the sill is formed with two flanges 30 separated by a flange 32 that is taller than the anges 3l?. The. inside border of the sill is oiset as at 3 3 and is provided With a flange 34 along the upper edge thereof, and a depending Vflange 36. The undersurface 38 of the sill 22 is formed with a relatively short ange 4i). As` seen Vin Figure 6, a plurality of perforations 42 are formed in the upper surface of the sill between the flanges 30 and 32 approximately wherershown, and the lower outer edge 44 of theV sill is formed with a pair (in the illustrated embodiment) of outwardly ex tending lips 4S forming elongated ports 46 for a purpose hereinafter made clear. The upper surface 28 of the sill also includes appendages or wings 47 (see Figure 6) for a purpose likewise hereinafter made clear.

The jambs 24 have a generally channel shaped configuration including side anges 48 and web 50. Each jamb is formed with an internal flange 52 that is positioned to be .verticallyaligned with the taller-ange 32 of the VVsill when the jambs are fixed to theV sill. vEach jamb also includes an elongated lin or flange 54 along the inside edge of the respective jambs.

. As seen morev particularly in Figure 2, the internal surface of each jam'o, besides being formed with internal flange 52is alsoformed with ridges 56 having rounded undercut grooves 58 formed therein, with surfaces-60 leading to said grooves 58. Each jamb has fixed thereto a'sash latch catch element 55 (see Figure 6b) comprising a flat strip 57 having one end 59 thereof bent normally of the strip and lingers 61 of said end 59 bent toward each other. y-The respective strips 57 are fixed against the inner surface of inside flange 48 of each jamb, said strips extending through slots 63.formed in webs 50 and ends 59 positioned in notches 65 formed in flanges 48, rivets 167 or the like securing strips 57 in place. Y

The head section 26 comprises a generally channel shaped member including side ilanges 62 and a web 64,V

Vin which an internal flangeV 66 is formed. Preferably, the anges 62 and 66 yare of the same length. The head section 26 also includes a flange or fin 68 extending from the inner edge thereof, which ange or iin projects beyond the ends of the head Vsection proper, as seen in Figure 6. The head section 26 of the illustrated embodiment also includes a J-shaped appendage 70 for purposes hereinafter made clear.

As seen more particularly in Figure 3, the linternal flange 66 of the head section of the window frame is provided with inwardly projecting protuberances 67 and outwardly projecting protuberances 69. j

Preferably, this is done by a stamping operation before the head section isV secured to the other elements of the window frame, and preferably, any perforations in the metal are sealed over by a suitable adhesive to preclude the possibility of drafts. Y

The window frame is assembled by inserting conventional self-tapping screws 72 through holes 74 formed in the sill and head section, which holes 74 are positioned for alignment with the rounded grooves 58 formed in the jambs 24. The screw threaded portions of screws 72 engage the internal surface of these grooves 58 to hold the elements in assembled relation.

The wings or appendages 47 of the sill at each end thereof are bent upwardly and ilat against the back surface of the respective webs 50 of the jambs 24 (see Figure This seals off the joint between the upper surface 28 and the respective jamb webs 50.

The jambs 24 may be slotted'as at 76 to receive the anges 66 and 34 of the head section and the sill, and as shown in Figures 6 and 6a, the head section and jambs may be recessed as at 77 to receive the respective anges 48 `and 62. Flanges 30 and 32 of sill 22 are abridged as at 79 to receive the lower ends of jambs 24. It will be appreciated that these interengaging elements of the frame provide an exceptionally strong, rigid structure. Preferably, the ends of the tubular sill are closed by pressing sill plugs 78, made from, for instance, aluminum, within the sills.

The sashes The inner sash 18 (see Figure 5) comprises a bottom rail 80, a top rail 82, and side rails 84 and 86. The side rail 84 of the illustrated embodiment also comprises the pull rail of the sash, and the side rail 86 comprises th meeting rail of the sash. Y

The individual rails of sash 18 also are preferably extruded aluminum elements. The top and bottom rails 80 and 82 have generally the same cross sectional configuration, as seen more particularly in Figure 4. The top 4 and bottom rails each comprise an elongate element having a generally H-shaped configuration including web 89 and legs 90, 92, 94, and 96 in which the outer surface of leg 94 is formed with a longitudinally extending undercut groove 98, and in which the legs 92 and 96 on the other side of web 89 are formed with flanges 102 projecting toward each other. Also, leg is formed with a short projection 184 that projects towards leg 94, and the outwardly facing surface of the bottom rail is formed with a short outwardly projecting flange 95 that forms a drip sill, as hereinafter described.

The side rails 84 and`86 have a somewhat different construction. The side rail 84, as seen more particularly in Figure 2, generally comprises an elongate element having a generally channel shaped cross sectional configuration including legs 106 and a relatively thick web 108, in which both sides of the element are formed with the longitudinally extending undercut grooves 110, similar to grooves 98. The ends of legs 106 are formed with flanges 112 that project towards each other, and the back of the Yelement 84 is formed with a rounded groove 114. Outwardly of the groove 114 in this element, right angled surfaces 116 define an lenlarged area of the groove which merge into inclined surfaces 118 that in turn merge into groove 114. The inwardly facing leg 106 includes an inwardly projecting flange 117 which comprises the hand gripping element of the sash.

The side rail 86 generally comprises an elongate element having a generally channel shaped cross-sectional conliguration including legs 120 and 121 formed with opposed projections or flanges 122 and in which the inside surface of the web 124 is formed with a rounded groove 128. The outer side of rail 86 is formed with an undercut groove similar to grooves 98 and 110 and projections 132 extend from the web 124- of the rail 86. The outer projection 132 is formed with an outwardly extending flange 134 and leg 121 is formed with an outwardly extending ange l135 (see Figure 2) for purposes hereinafter made clear.

A latch or locking device 136 is mounted on the hand gripping flange 117 of the rail 84. The latch device comprises an angle shaped latch element 140 (see Figure 8) including a handle portion 142 positioned at right angles to a notched portion 144.* The latch element 140 is positioned between sides 1146 of lock case 148 and is pivoted to the lock case 148 by a suitable pin 150 adjacent the juncture of the portions 142 and 144. A V-shaped spring element 152 (see Figure 8a) is interposed between the latch element 140 and the ilange 117. The spring element 152 generally kcomprises a'length of music spring wire formed in the shape of a U, with the legs 155 bent at an acute angle, somewhat as shown in'Figure 8a, and is arranged so that the web 156 bears against the handle portion 142 of latch element 140 while the ends of the legs bear against the base 151 of lock case 148. The base 151 of case 148 is xed, as by rivets 153, to flange 117, the case extending through a suitable slot formed in the flange 117.

Y The top and bottom rails 80 and 82 are cut away suiciently, as at 158, to receive the ends of the side rails 84 and 86. Self tapping screws 160 passing through holes 162 formed in webs 89 of the top and bottom rails secure the top and bottom rails to the side rails. f In the illustrated embodiment, the screws are screw threadedly received in the rounded grooves 114 and 128, respectively, Of the Side rails 84 and 86. f f v The screws 160 also respectively secure in place a pair of glide blocks 164 Yand a pair of aligning blocks 166. The glide blocks 164 are mounted on glide block holders 168 which are received between the legs 90 and 94 of the bottom rail 80 and screws 160 pass through holes 170 formed in ythese glide block holders. As shown in Figure 9, the aligning blocks 166 are each received at the Yend of the top rail 82 and screws 160v pass through a hole 172 formed in these elements.

The glide blocks 164' and the aligning blockslare. preferably made from a substance that eliminates fliction as much as possible and a product known in the art as 66MS Nylasint, made by the E. I. du Pont de Nemours and Co. of Wilmington, Del., is preferred for this purpose. Another suitable product is nylon, made by the same company.

The glide blocks and aligning or guide blocks are, preferably shaped substantially as shown in Figures 7a and 9, respectively. The glide blocks 164 generally comprise a U-shaped element including legs 176 separated by a slot 178 and including a protuberance 180 extending from a leg 176. This protuberance 180 iitsrwithin the slot defined by the ange or projection 104 of a leg 90` of the bottom rail S8. The aligning block` 166 illustrated (see Figure 9) generally comprisespan element having in the main a rectangular parallelepiped configuration but including a rounded end 182 which projects beyond the side of the top rail 82 on which the block V166 is mounted and engages one of the side flanges 62 of the head section 26 of the window frame when the sash is mounted in the frame 16 (see Figure 4).

The sash 18 receives a pane 184 (see FigureV 7) of transparent material, such as glass, and a novel form of gasket or sealing element 186 sealingly mountstherpane 184 in the sash.

The gasket or sealing element 186 is provided with the unstressed coniiguration shown in Figure 7b, and as indicated, the sealing element is provided with a generally U-shaped configuration including legs 188, web 190 joining legs 188, wings 192 extending from the endsrof the legs 188, and protuberances 194 formed on the legs 188. 1t will be noted that the wings 192 extend outwardly of the legs 18S and are inclined toward the web 190. The ends of the legs 188 are formed with outwardly projecting edges 196 for purpose hereinaftermade clear. The illustrated element 186 is a vinyl extruded product,

Before the side rails and top and bottom rails are assembled, the sealing element 86 is applied to the pane 184. This may be done as the sash` is assembled, the sealing element being slotted at the corners of the sashto accommodate the right angled corners ofthe pane 184, somewhat as shown in Figure 7. In mounting the glass within the rails of the sash, the length of the sealing element that is to be received in a particular rail is mounted on the pane, the legs 188 being received over the pane, and then the rail is slipped over the web and adjacent portions of legs 188 of this element. The rail is driven home over the sealing element with a suitable mallet.

When each rail is properly received overthe sealing element 186, the projections 102 of the top and bottom rails and the projections 112 and 122 of the side rails will be received between the wings 192 and the protuberances 194, and the wings 192 will be flattened out against the outwardly facing surfaces of these projections. By so doing, the edges 196 are urged' into sealing engagement with the pane 184 to provide an unsually effectiveV seal.

After the rails are assembled about the pane 1,84, weather stripping 200 and 261m is applied to the grooves 93, 110, and 131i. The weather stripping preferably cornprisesvwhat is known in the art as wool pile Schlegel cloth or its equivalent, and when applied to theseY undercut grooves, extends about the entire perimeter of the sash, the side rail stripping ends extending into notches 201 of rails 8G and 82 and abutting their weather stripping. The weather stripping 20611 of the sash meeting rails 86 preferably has a `deeper pile as shown in Figure 2 so that the piles of these rails will intermesh when the vents are both closed.

The outer sash 29 (see Figure 7) is constructed and arranged in a manner similar to the inner sash 1S and identical parts have been given correspondingly identical reference numerals. The only material difference. between the inner and outer sash is that the pull rail shown in dotted lines in Figure ll.

6.. ange 117 of the outer sash is wider since it must extendlfurther to present the hand gripping portion thereof for easy access by the operator, and the drip sill A9,5 is` eliminated.

APPLICATION AND OPERATION 'Ihe Window frame 16 is applied to the wall framing 12 by properly positioning the offset 33 of the sill'22'i`n the rough opening of -the Wall framing, and then driving nails 216 through the fins or flanges 36, 54 and 68 ofthe win-dow frame. After the masonry 14 has been erected, suitable caulking is applied where shown at 212 in Figure 4 and at 214 in Figure 2 to seal all cracks about the window frame.

The sashes 18 and 20 may then be applied from either outside or inside of the window in the manner indicated in Figures 3, 13, land 14. As, for instance, the protuberances 67 are positioned to project over the inner sash 18 when same is in `the closed position lshown in Figure 2 they will ypreclude ver-.tical movement of the sash in this position, and it is thus apparent that the distance between the lower edges of protuberances 67 and the top. of the sill flange 30 on which the inner sash is mounted isless than the distance Ibetween the lower edges of the protuberances 67 'and the lower edges of the inner sash glide block legs 176, which prevents the sash from being swung onto or from the sill flange 311 (when the sash is disposed with respect to the sill in a posi-tion corresponding to its said closed position). However, when the inner sash 18 is moved to the left of Figure 3 and away from the protuberances 67, enough room is provided above the top of thesash to permit it -to `be moved upwardly sufliciently yand then swung inwardly (as sho-wn in Figure 13) or out# Wardly to be removed and conversely, to be applied thereto. The outer sash 20 and the protuberances 69 are arranged in a similiar manner. Thus, the outer sash may be removed from the inside `after Ithe inner sash has been removed by moving the outer sash to the right of Fig'- ure 3 and then lifting it upwardly and yswinging it either inwardly as shown in Figure 14 or outwardly.

Figuresll and 12 illustrate la latch device 220 which aids in making the window 11) substantially burglarproof. A rigid element 222 is pivoted to the flange 34 of the sill 22 as `at 224 in any suitable manner, and -said element 222 has pivoted at one end thereof an elongate latch bar 226 which is adapted to swing over the path of movement of the `inner -sash 18 and lodge in a notch 228 formed inthe bottom rail 86 of the outer sash 20.

In the inoperative position, the latch device appears as However, when it is desired to place the device 224i into operation, the elements lare positioned as shown in Figure l2. ThisV permits only la limited sliding movement of the inner sash to the left of Figures 1 yand 3 in the event that a burglarV is successful in unlatching latch element 141i of the inner sash, or this element is inadvertently left unlatched. The limited sliding movement allowed is insuiicient topermit the person seeking entrance to reach around panell and unlock device 22), and, of course, the inner sash 18 cannot be removed in the position it is in when device 22) is applied. v

As indicated .in Figure 8, the latch element 136 is pref.- erably arranged so that, even though some vertical movement of the inner sash within the window frame is permitted, the notched end 144 of the element 140 remains in engagement with the catch element 55. This is done. by insuring that the latch element has a substantial range of pivotal movement, and in the illustrated embodiment, the slot formed in lock case base 151 is su'iciently long to permit the latch element to assume at least the two locking positions indicated in Figures 1 and 8. i

The appendage 70 is provided in the frame 16 to receive screen 'and `storm sashes of a conventional make.l

7 Advantages of invention.

Our invention provides a number of results that are a Substantial improvement over conventional sliding windows.

It will be noted, for instance, that the sill 22 is not rectangular in cross-sectional coniiguration, but inclines downwardly `and outwardly of the window. Moisture condensing on the glass and metal surfaces of the window, if substantial in quantity, will tend to collect in the spaces between flange 32 yand the flanges 30 of theV sill and pass into the center of the sill -through the respective perforations 42. The moisture will then tend to ow toward and out of the weep holes 46, which also permit rapid evaporation of 4any liquid remaining within the sill.

The tubular configuration of the sill gives the entire window maximum strength and rigidity, `and insures that the sash tracks remain level and true for smooth, easy operation. The reason is that the sill and its flanges 30 are of one piece construction, which rigidly holds the bases of iianges 30 so that their upper edges retain the 'rectilinear longitudinal configuration indicated in the drawings.

As has been noted hereinbefore, the entire peripheries of the sashes are provided with weather shipping 200. This Weather stripping is urged into contact with the ange 32 of the sill, the internal anges 52 of the jambs, land the internal flange 66 of the head section of the window fname, by the glide blocks 164 and the aligning blocks 166. When the sashes are both in closed position, the weather stripping of the two meeting rails of the sashes contact each other and intermesh to form a.

substantial Weather seal lat this point. Flanges 134 of sash rails S6 are in contact with the respective rails 86 to substantially isolate the intermeshed weather stripping of the two meeting rails and further seal the Window against drafts `at this point. Flanges 135 increase the contact area between the rails 86 and iianges 134. When the windows are lboth closed, the configuration of the side rails land the positioning of weep ports y46 -and perforations 42 provide circuitous paths for any air that might be forced in through the window by high winds or the like, which, in addition to the weather stripping, substantially eliminates the possibility of drafts. As shown in Figure 2, ridges 56 t into and against right angled surfaces 116 of sash rails 84 to provide a substantially complete seal. Moreover, the sealing element in which the panes 184 are mounted substantially precludes drafts at this point in the window. Weather stripping may be applied to the inwardly facing groove 110 of the inner sash and the outwardly facing groove 110 of the outer sash if so desired, though none is shown in the illustrated embodiment.

It will be noted lfrom Figure 4 that drip sill 95 of inner sash rail 80 overhangs ange 32 of the sill, and protects the weather stripping 290 immediately under it from access weathering. It also prevents outside moisture from having access -to perforations 42 Iunder the sash 18.

The sashes are both easily removed when positioned as described above, which permits easy cleaning and 100% ventilation when desired. When positioned in locked position, they cannot be removed, either from the inside or outside. The `sealing element 186 eliminates the conventional mastic glazing compounds formerly required to mount panes. Y

The locks of -both sashes of the illustrated embodiment comprise self-locking stainless steel hardware arranged to permit independent operation thereof. They are positive, simple and attractive.

The sashes are mounted on a minimum of antifriction glides kand aligning blocks Vwhich substantially eliminates undesirable friction in operation of the sashes.

'I'he safety latch 226 insures that the window may not be opened from the outside.

While` the invention has been illustrated as applied to two vent windows, it will be apparent that it is applicable to windows employing one or more than Vtwo vents, and in which one or more vents may be fixed ones.

- The foregoing description and the drawings are given merely to explain and illustrate our Vinvention andthe inventionis not to be limited thereto except insofar as the appended claims are so limited since those skilled in the art who have our disclosure before them will be able to make modifications and variations therein without departing from the scope of the invention.

We claim:

1. A window structure of the horizontally sliding sash type comprising a window frame including a sill formed on its upper surface with a plurality of spaced upstanding anges extending longitudinally thereof, said flanges including a taller flange separating two shorter flanges, said frame also including channel shaped jambs arranged with the anges thereof opposing each other and each including an internal ange aligned with said taller ange of said sill, said frame further including a head section, said head section being generally channel shaped and positioned with the anges of its channel shape extending toward said sill, said head section including an internal flange vertically aligned with said taller ange of said sill, a sash slidably mounted on each of said shorter anges of said sill to provide an inner and an outer sash for the window structure, said sash each comprising a bottom rail, a top rail and spaced pull and meeting rails forming 4the side rails thereof, a pair of spaced antifriction glide blocks interposed between each sash bottom rail and the shorter ange of said sill on which the sash is mounted, said glide blocks being formed with a downwardly opening slo-t in which the respective shorter flanges are received, whereby said guide blocks ride on top of the respective shorter anges to mount the respective sash thereon, each sash including weatherstripping about the entire border of each of the sides thereof facing said taller ange of said sill, each sash top rail extending into horizontal alignment with said internal ange of said head section and the side iiange thereof on the side of the window frame at which the sash is mounted, each sash top rail carrying spaced antifriction guide members along their respective top rails, said guide members being in sliding engagement with the head section ange of its channel shape on the side of the window frame on which the sash is mounted, said guide members being proportioned to press .the weatherstripping of the sash along their top railsinto engagement with said internal flange of said head section, said slots of said glide blocks being positioned to cause the Weatherstripping along the bottom rails of the sash to be pressed against said taller flange of said sill, with the weatherstripping of the respective sash pull rails contacting the respective internal flanges of said frame jambs when said sash are positioned adjacent them, and the weatherstripping of the respective said meeting rails intermeshing when said weatherstripplug of said pull rails contacts the respective frame jamb internal flanges.

2. The window structure set forth in claim l wherein the inner sash on its bottom rail includes an outwardly projecting, generally horizontal flange overlying said taller iiange of said sill whereby the weatherstripping carried by said inner sash bottom rail is protected from excess weathering.

3. A window structure of the horizontally sliding sash type comprising a window frame including a sill formed on its upper surface with a plurality of spaced upstandlng sash track forming anges extending longitudinally thereof defining upwardly facing edges that are rectilinear in longitudinal configuration, said frame also including side jambs and a head section, a sash slidably mounted on each of said flanges of said sill,'said sash each comprising a bottom rail, a top rail and spaced side rails, a pair of antifriction glide blocks interposed between each sash bottom rail and the flange of said sill on which the sash is mounted and resting on said upwardly facing edges of the respective flanges, said sill including said track forming flanges being of one piece construction and tubular in cross sectional configuration whereby said edges of said flanges are rigidly held in their said rectilinear configurations.

4. A window structure of the horizontally sliding sash type comprising a window frame including a sill formed on its upper surface with a plurality of spaced upstanding flanges extending longitudinally thereof, said fianges including a taller iange separating two shorter anges, said frame also including jambs and a head section, said head section being generally channel shaped and positioned with the tianges of its channel shape extending from the web thereof toward said still, said anges of said head section defining planar continuous Walls of uniform height throughout their lengths said head section including m internal ange vertically aligned with said taller ange of said sill, a sash slidably mounted on each of said shorter anges of said still, said sash each comprising a bottom rail, a top rail and spaced pull and meeting rails forming the side rails thereof, said sash bottom rails having grooved portions that rest on the respective shorter flanges of said sill to slidably mount the respective sash on said sill, said grooved portions each being formed with a groove in which the upper edge of the respective shorter flanges of said sill is received and thereby defining said grooved portions into legs that extend below the respective upper edges of said shorter anges of said sill when the respective sash are slidably mounted on the respective sill shorter flanges one of said sash forming the inner sash of the window structure and the other sash forming the outer sash thereof, said sash including said grooved portions thereof being shorter in height than the distance between the tops of said sill shorter anges and the web of said head section to permit removal of the sash by lifting the sash from the respective shorter anges into the space between the respective side flanges and internal flange of said head section and swinging the sash inwardly, said internal ange of said head section being formed with spaced indentations that project over the respective sash when they are in their closed positions a distance in excess of the clearance between the respective sash top rails and said internal ange of said head section, whereby the sash cannot be removed from the frame when in their closed positions by reason of engagement with the respective indentations when raised toward said web of said head section.

5. In a window structure of the horizontally sliding sash type including a frame structure including a sill formed with inner and outer tracks on which an inner sash and an outer sash are respectively slidably mounted,

and an upstanding ange on its inner side extending longitudinally thereof and projecting above said tracks, said sash including meeting rails that are in juxtaposition when the sash are in their closed positions, an improved latching arrangement therefor comprising a rigid larm pivoted at one of its ends to the sill ange for movement about a substantially horizontal axis that extends perpendicularly of the sill, said arm being of a length that exceeds the vertical distance between said axis and the top of said sill ange so that when it is positioned in an upright position, its other end projects above the sill ange, a latch bar pivoted to said other end of said arm for movement about an axis that extends perpendicular to the first mentioned axis, said rigid arm being pivoted to the sill flange adjacent said meeting rails when same are in their juxtaposed positions and being disposed with respect thereto to permit said latch bar to be swung toward the outer sash across the path of movement :of the inner sash, said outer sash being formed with notch means to receive said latch bar, said latch bar being movable from its lat-ching position by swinging saine about the second mentioned axis, after which said latch bar may be moved to an out :of the way position below said sill ange by swinging said arm about the first mentioned axis away from its upright position.

References Cited in the tile of this patent UNITED STATES PATENTS 981,486 Shaner a Ian. 10, 1911 2,024,192 Verhagen Dec. 17, 1935 2,144,782 Swanson Ian. 24, 1939 2,239,947 Vanderveld Apr. 29, 1941 2,463,432 Russell et al. Mar. 1, 1949 2,527,740 Kurtzon Oct. 31, 1950 2,530,724 Pierson Nov. 2l, 1950 2,583,107 Krantz Jan. 22, 1952 2,627,092 Grossman Feb. 3, 1953 2,652,907 Miller Sept. 22, 1953 2,663,917 Peterson Dec. 29, 1953 2,684,506 Tadd July 27, 1954 2,685,110 Hauck Aug. 3, 1954 2,699,204 Davis Ian. 11, 1955 2,702,414 Holden Feb. 22, 1955 2,747,240 Peterson May 29, 1956 2,787,034 Hauck Apr. 2, 1957 2,812,836 Zitomer Nov. 12, 1957 FOREIGN PATENTS 396,839 Great Britain Aug. 17, 1933 689,750 Great Britain Apr. 1, 1953 

